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研究生： 張力偉
Alieu Jagne
論文名稱： Investigation of Slurry Supported Trench Stability under Seismic Condition
Investigation of Slurry Supported Trench Stability under Seismic Condition
指導教授： 李安叡
An-Jui Li
口試委員: 鄧福宸
Fu-Chen Teng
郭治平
Chih-Ping Kuo
學位類別： 碩士
Master
系所名稱： 工程學院 - 營建工程系
Department of Civil and Construction Engineering
論文出版年： 2018
畢業學年度： 106
語文別： 英文
論文頁數： 89
中文關鍵詞： finite element limit analysis 、slurry trenches 、seismic coefficient 、plastic zone 、stress field 、stability charts
外文關鍵詞： finite element limit analysis, slurry trenches, seismic coefficient, plastic zone, stress field, stability charts
相關次數： 點閱：403  下載：9 
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    • As development continues, more and more tall apartment and office buildings are being built with basements that require slurry supported trenches for diaphragm wall construction. In the past, investigators have done studies into the stability of trenches. It was indicated that the trench stability analysis is a three dimensional problem due to arching effect from the finite length of the trenches. However, few studies have considered the seismic stability analysis of trenches. This thesis therefore aims to conduct research on the stability of slurry supported trenches under seismic conditions. However, it is not clear regarding its simulation conditions. In this study, finite element upper and lower bound limit analysis methods (LA) are used to study the stability of trenches under bentonite pressure in purely cohesive clay by considering seismic conditions and to produce stability charts to be used for preliminary by engineers.

    As development continues, more and more tall apartment and office buildings are being built with basements that require slurry supported trenches for diaphragm wall construction. In the past, investigators have done studies into the stability of trenches. It was indicated that the trench stability analysis is a three dimensional problem due to arching effect from the finite length of the trenches. However, few studies have considered the seismic stability analysis of trenches. This thesis therefore aims to conduct research on the stability of slurry supported trenches under seismic conditions. However, it is not clear regarding its simulation conditions. In this study, finite element upper and lower bound limit analysis methods (LA) are used to study the stability of trenches under bentonite pressure in purely cohesive clay by considering seismic conditions and to produce stability charts to be used for preliminary by engineers.

    TABLE OF CONTENTS ABSTRACT i ACKNOWLEDGEMENT ii LIST OF FIGURES v LIST OF TABLES viii LIST OF SYMBOLS ix CHAPTER 1 1 INTRODUCTION 1 1.1 Background 1 1.2 Objectives 3 1.3 Organization 3 CHAPTER 2 5 LITERATURE REVIEW 5 2.1 Trench Stability in Cohesionless Soils 5 2.2 Trench Stability in Cohesive Soils 12 2.3 Stress transfer and Deformation in slurry trenches 21 2.4 Stability Analysis 25 2.5 Comparison of different stability analysis methods 26 2.6 Earthquake Design Criteria 27 CHAPTER 3 30 THREE DIMENSIONAL FINITE-ELEMENT UPPER BOUND AND LOWER BOUND LIMIT ANALYSIS 30 3.1 Limit Analysis Theory 30 3.2 Introduction to the 3D models 32 3.3 Parameters 35 3.4 Analysis of Finite-Element Upper Bound and Lower Bound Limit Analysis 38 3.4.1 Horizontal Seismic Coefficient of Kh = 0.1 38 3.4.2 Horizontal Seismic Coefficient of Kh > 0.1 40 CHAPTER 4 42 SOLUTIONS AND DISCUSSION OF THE FINITE ELEMENT UPPER BOUND AND LOWER BOUND LIMIT ANALYSIS 42 4.1 Introduction 42 4.2 Stability Numbers and Chart Solutions 43 4.2.1 Solutions for Kh = 0.1 43 4.2.2 Border seismic coefficient, Kh 49 4.2.3 Solutions for Kh = 0.2 51 4.3 Failure Surfaces and Surface Influence Zones 56 4.3.1 Effect of undrained shear strength increasing with depth 57 4.3.2 Effect of trench size 57 4.3.3 Effect of seismic force direction 58 4.3.4 Effect of magnitude of seismic force 58 4.4 Comparison with previous studies 64 CHAPTER 5 68 CONCLUSION AND FUTURE WORK 68 5.1 Conclusion 68 5.2 Future work 69 REFERENCES 71

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